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Double it - to give 90 out of 100 - or 90%
45/50 is 90%. The easiest trick to do this is to double both numbers so that you have 100 as the denominator and 90 as the numerator. This makes calculating percentages much easier, because 90/100 is 90%.
One common multiple is 45 since this is 5x9.You can double this and have another common multiple. So 90 is another common multiple of 5 and 9.45 and 90
0.01×290 equals $1,237,940,039,285,380,274,899,124,224
90% of 90 = 90*90/100 = 81